In which specification is the interval distance between strong and weak bridges of integrated wiring written?

Code for acceptance of integrated wiring system engineering (GB 503 12-2007).

The installation of cable tray and trunking shall meet the following requirements:

1, the installation position of bridge and trunking shall conform to the requirements of construction drawing, and the left-right deviation shall not exceed 50 mm ..

2, bridge and trough levelness deviation per meter should not exceed 2 mm ..

3, vertical bridge and trough should be perpendicular to the ground, verticality deviation should not exceed 3 mm. ..

4. Truncation of trunking and splicing of two trunking shall be smooth and burr-free.

5, hanger and bracket installation should be vertical, neat and firm, no skew phenomenon.

6, metal bridge, trough and metal pipe paragraphs should maintain good connection, installation is firm.

7. When laying cables with suspended ceiling support columns, the support points should avoid the position of ground grooves and trunking, and the support should be firm.

Extended data

1. In engineering design, the bridge layout should be comprehensively compared according to economic rationality, technical feasibility, operational safety and other factors to determine the best scheme, and fully meet the requirements of construction, installation, maintenance and cable laying.

2. The height of the bridge frame from the ground is generally not less than 2.5m when it is laid horizontally, and the part below 1.8m when it is laid vertically should be protected by metal cover plates, except when it is laid in a special electrical room. When the cable tray is laid horizontally on the equipment interlayer or artificial path and is less than 2.5m, protective grounding measures should be taken.

3. When bridges, trunking and their supports and hangers are used in corrosive environment, they should be made of corrosion-resistant rigid materials or treated with anticorrosion, which should meet the requirements of engineering environment and durability. Aluminum cable tray is used in places with high requirements for corrosion resistance or cleanliness.

4. In the area with fire protection requirements, the cable ladder and bridge can be added with fire-resistant or flame-retardant materials to form a closed or semi-closed structure, and measures such as painting fire-retardant paint on the surface of the bridge and its supports and hangers can be taken to make the overall fire resistance meet the requirements of relevant national codes or standards. Aluminum cable tray should not be used in places with high fire protection requirements.

5. Cables that need to be shielded from electromagnetic interference, or environmental requirements such as outdoor sunlight, oil, corrosive liquid and flammable dust. , external shadows should be avoided. Non-perforated tray cable trays shall be selected.

6, where dust is easy to accumulate, cable tray should choose cover plate; It is suggested to add pads or use non-porous trays on the underpasses of public passages or outdoor street crossing sections.

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Baidu Encyclopedia-Code for Acceptance of Integrated Wiring Engineering